In Penrith, Sydney, the temperature topped out at 47.3C on Sunday, which was the highest seen in the whole of the city metropolitan area since 47.8C was recorded back in 1939.
The agency had predicted that temperatures would soar, tweeting: "Are we forecasting all time record high temperatures today?"
"It looks like it's the highest temperature recorded in the Sydney area in 80 years", Jacob Cronje, a Senior Meteorologist with Weatherzone, said. "No, but it would not surprise if some stations go close". Police are advising people to stay hydrated and look out for the elderly.
Players participating in the Sydney global tennis tournament were forced off the court at 10:00 local time on Sunday (23:00 GMT Saturday) by the event's organisers after temperatures courtside exceeded 40C. They warned tourists to take extra care if swimming and issued a reminder that it was an offense to leave children or pets unattended in a vehicles - actions that could be deadly in the heat.
In Penrith, west of Sydney, residents sweltered as the town bore the brunt of the heat on Sunday.
EPA FLOCK Beaches were packed today in Sydney Australia
A total fire ban is in place across Sydney and the Hunter region as NSW residents face temperatures soaring into the mid-40s.
That's the second hottest day in Sydney's 158 years of recorded history.
The Ashes cricket Test between Australia and England saw temperatures rise to what is likely its hottest day of play since 1908 when the mercury reached 43.1 degrees in Adelaide.
Social media was awash with depictions of the heat, GIFs showed burning skeletons and there were a variety of attempts at egg-frying outside.
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